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asyncssh 2.9.0 raises AttributeError: 'NoneType' object has no attribute 'encode' in know_hosts.py

See original GitHub issue

When I connect to realhost.host via asyncssh.create_connection(asyncssh.SSHClient, host='realhost.host') I get the following:

...
  File "/venv/lib/python3.8/site-packages/asyncssh/connection.py", line 7977, in create_connection
    conn = await connect(host, port, client_factory=client_factory,
  File "/venv/lib/python3.8/site-packages/asyncssh/connection.py", line 7646, in connect
    return await asyncio.wait_for(
  File "/usr/lib/python3.8/asyncio/tasks.py", line 455, in wait_for
    return await fut
  File "/venv/lib/python3.8/site-packages/asyncssh/connection.py", line 396, in _connect
    new_tunnel = await _open_tunnel(tunnel, options.passphrase)
  File "/venv/lib/python3.8/site-packages/asyncssh/connection.py", line 375, in _open_tunnel
    return await connect(host, port, username=username,
  File "/venv/lib/python3.8/site-packages/asyncssh/connection.py", line 7646, in connect
    return await asyncio.wait_for(
  File "/usr/lib/python3.8/asyncio/tasks.py", line 455, in wait_for
    return await fut
  File "/venv/lib/python3.8/site-packages/asyncssh/connection.py", line 439, in _connect
    await options.waiter
  File "/venv/lib/python3.8/site-packages/asyncssh/connection.py", line 1216, in connection_made
    self._connection_made()
  File "/venv/lib/python3.8/site-packages/asyncssh/connection.py", line 3105, in _connection_made
    self._match_known_hosts(cast(KnownHostsArg, self._known_hosts),
  File "/venv/lib/python3.8/site-packages/asyncssh/connection.py", line 1081, in _match_known_hosts
    match_known_hosts(known_hosts, host, addr, port)
  File "/venv/lib/python3.8/site-packages/asyncssh/known_hosts.py", line 374, in match_known_hosts
    known_hosts = known_hosts.match(host, addr, port)
  File "/venv/lib/python3.8/site-packages/asyncssh/known_hosts.py", line 275, in match
    x509_subjects, revoked_subjects = self._match(host, addr, port)
  File "/venv/lib/python3.8/site-packages/asyncssh/known_hosts.py", line 217, in _match
    matches += (match for (entry, match) in self._pattern_entries
  File "/venv/lib/python3.8/site-packages/asyncssh/known_hosts.py", line 218, in <genexpr>
    if entry.matches(host, addr, ip))
  File "/venv/lib/python3.8/site-packages/asyncssh/known_hosts.py", line 114, in matches
    return self._match(host) or self._match(addr)
  File "/venv/lib/python3.8/site-packages/asyncssh/known_hosts.py", line 108, in _match
    hosthash = hmac.new(self._salt, value.encode(), sha1).digest()
AttributeError: 'NoneType' object has no attribute 'encode'

Downgrating to 2.8.1 fixes the issue.

.ssh/config:

Host bastion.host
  ForwardAgent yes

Host realhost.host
  ProxyJump bastion.host

Issue Analytics

State:
Created 2 years ago
Comments:8 (6 by maintainers)

Top GitHub Comments

2reactions

ronfcommented, Mar 26, 2022

This change is now available in AsyncSSH 2.10.0.

1reaction

ronfcommented, Jan 26, 2022

Ok - the fix is now available as commit 018e013 in the “develop” branch. Thanks again for reporting it! If you have any further issues, please let me know…

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